code: def _test_traceback(cls):
      raise RuntimeError(123)
  
imports: import os
  import sys
  import threading
  import time
  import unittest
  from concurrent import futures
  from concurrent.futures.process import BrokenProcessPool
  from test import support
  from test.support import hashlib_helper
  from .executor import ExecutorTest, mul
  from .util import ProcessPoolForkMixin, ProcessPoolForkserverMixin, ProcessPoolSpawnMixin, create_executor_tests, setup_module
label_desc: Use image node_id 4 for calling the ProcessPoolExecutorTest obj's underlying member method code with example usage: obj._test_traceback(cls) without return types